<template>
  <div class="login">
    <!-- 登录面板 -->
    <div class="login-box">
      <div class="login-box-title">后台管理系统</div>
      <div class="login-box-from">
        <el-form
          :model="loginForm"
          :rules="rules"
          ref="loginForm"
          class="demo-ruleForm"
        >
          <el-form-item prop="username">
            <el-input
              v-model="loginForm.username"
              placeholder="请输入用户名"
              size="medium"
            >
              <el-button slot="prepend" icon="el-icon-user"></el-button>
            </el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              v-model="loginForm.password"
              placeholder="请输入密码"
              size="medium"
            >
              <el-button slot="prepend" icon="el-icon-key"></el-button>
            </el-input>
          </el-form-item>
          <el-form-item>
            <el-button
              type="primary"
              size="medium"
              :loading="loading"
              style="width: 100%"
              @click="submitForm('loginForm')"
              >立即登陆</el-button
            >
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    let letterRule = (rule, value, callback) => {
      let reg = /^[a-zA-Z0-9_-]{4,18}$/;
      if (value === '') {
        callback(new Error('输入内容不能为空'));
      } else if (!reg.test(value)) {
        callback(new Error('请输入字母、数字、下划线'));
      } else {
        callback();
      }
    };
    return {
      loading: false, //登陆状态
      loginForm: {
        // 登陆表单
        username: 'wangwu',
        password: '123456',
      },
      rules: {
        //登陆验证规则
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          {
            min: 2,
            max: 18,
            message: '长度在 2 到 18 个字符',
            trigger: 'blur',
          },
          { validator: letterRule, trigger: 'blur' },
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          {
            min: 6,
            max: 16,
            message: '长度在 6 到 16 个字符',
            trigger: 'blur',
          },
          { validator: letterRule, trigger: 'blur' },
        ],
      },
    };
  },
  watch: {
    $route: {
      handler: function (route) {
        this.redirect = route.query && route.query.redirect;
      },
      immediate: true,
    },
  },
  methods: {
    submitForm(formName) {
      this.$refs[formName].validate((valid) => {
        if (valid) {
          this.loading = true;
          this.submitLogin();
        } else {
          return false;
        }
      });
    },
    submitLogin() {
      this.$store.dispatch('Login', this.loginForm).then(() => {
        this.loading = false;
        this.$router.push({ path: this.redirect || '/' });
      });
    },
  },
};
</script>

<style scoped>
.login {
  width: 100%;
  height: 100%;
  position: relative;
  background-image: url('~@/assets/loginBG.jpg');
  background-size: 100% 100%;
}
.login-box {
  width: 350px;
  background: hsla(0, 0%, 100%, 0.3);
  border-radius: 5px;
  box-shadow: 0 0 2px #f7f7f7;
  border: 1px solid #f7f7f7;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -175px;
  margin-top: -150px;
}
.login-box-title {
  line-height: 50px;
  font-size: 20px;
  color: #ffffff;
  text-align: center;
  border-bottom: 1px solid #ffffff;
}
.login-box-from {
  width: 100%;
  height: auto;
  padding: 30px;
  box-sizing: border-box;
}
</style>
